Fire-box for locomotive-engines.



H. DE W. SAWYER.

FIRE 80X FOR LOCOMOTIYE ENGINES. APPLICATION FILED JAN. 13. 19H.

1,275,763. Patented Aug. 13,1918.

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H. DE W. SAWYER. FIRE BOX FOR LOC'OMOTIVE ENGINES APPLICATION FILED JAN-13.19H.

Patented Aug. 13, 1918.

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NITED sTATEs PATET HOW RD DE WOLFE sAwYEE, OE REVERE, MASsAcHUsETTs, Assronoga, BY nIEEoT AND MESNE ASSIGNMENTS, To WILLIAM. H. KIMEALL, OE EoSTon, MASSAGHU- SETTs, As TRUSTEE EOE WILLIAM H. KIMEALL, OE BOSTON, MAssAcHUsETTS,

, FIFTEEN THIRTY-SECONDS; HOWARD DE W. SAWYER, REVERE, MASSACHUSETTS,

FIFTEEII THIRTY-SECONDS; AND HERBERT B. NEWTON, 0F BROOKLINE, MASSA- GHUSETTS, TWO THIRTY-SECONDS.

FIRE-BOX 1301B.LQGOMQTIYE-ENGINES.

I Specification of Letters Patent.

Patented Au 1a, 1918.

Application fiia January 13,1911. SerialNo. 602,432.

To all whom it may concern:

Be it known that I, HOWARD DE WOLFE SAWYER, of Revere, in the county of Suffolk and State of Massachusetts, have invented certain new. and useful Improvements in Fire-Boxes for Locomotive-Engines, of which the following is a specification.

The object of this invention is to provide for locomotive and other boilers an im: proved construction of fire-box, embodying in a practical form anew arrangement of tubular, water-containing grate-bars with a system of downward draft between such bars, whereby the gases evolved andall volatile products of combustion are consumed as fuel, instead of contaminating the air, endangering adjacent property and starting forest fires in the regions through which the locomotives pass. The general construction and certain novel features thereof are hereinafter described, and the present invention especially referred to in the appended claims.

A special feature of this improvement is the peculiar depending end of the fuel cham er, supported by the grate tubes and their upward extensions to the crown sheet and additionally by an arched plate fixed to said sheet, such barrier enforcing the draft downwardly between the tubes of the grate into the as combustion chamber beneath it and ehind said barrier.

In the accompanying drawings Figure 1. represents a longitudinal central section taken vertically through my improved firebox; Fig. 2. a horizontal section thereof, on the line 2-2 of Fig. 1. and Fig. 3. a transverse section, taken on the broken line 3--3, Fig. 1. looking to the left. Fig. 1 represents a detail. a i

The boiler here illustrated has hollow, water-containing walls 6 connecting with the steam space 7 above the crownsheet 8 and horizontal flues 9. The fire-box comprises the fuel chamber 10, above the fuel.

that half ofthe series extend atthe inner barrier at the inner.

end considerably beyond the others. Each tube there has an upward extension 13 with coupling 14:, and, at top, a union or other.

threaded joint connecting it, through an arched reinforcing plate 23, to the crown sheet 8, thus providlng continuous water currents between the Water wall 6 and steam space 7, and affording substantial support to the barrier.

With the tubes thus arranged and in the space inclosed by them, between the side walls of the boiler, I build up, of fire bricks of'suitable sizeand shape, the barrier 15, which serves to deflect downwardly the draft entering through the fuel door 16, and carry the caloric current between the grate tubes, as stated. The fire bricks are readily inserted edgewise through the wide spaces between the upright extension tubes 13, see Figs. 2 and 3, and then properly placed upon and above the alternate projecting tubes 12 and any crevices filled with cement. Such a a barrier is of great durability, holds the heat for many hours and leaves the tubes 13, in front and back of it, exposed at all timesto the full intensity of the caloric current. Furthermore it requires no cutting away of the water walls of the firebox since its ends 1 do not communicate therewith.

To facilitate connecting the upright tubes 13 to the crown sheet 8, especially at the edges of the barrier 15, T have devised the tubular manifolds 17, conforming marginally to the general sweep of the fire-box where its side walls merge in, the crown sheet. The upper end of this manifold is enlarged and connected by a union or other joint, and there are two or more depending arms, internally threaded at bottom, to receive the tips of the respective upright tubes 13. Fig. 3, shows in fulllines three of these tubes connecting with one manifold and two with the other, while the dotted lines denote respectively two and three such uplrights connecting with the manifolds of the opposite faceof the barrier and coupled to the alternate grate tubes.

The detail drawing Fig. 4 shows a sectional illustration of this construction.

In view of the great heat of the down draft current I provide my fire-box with a substantial fire brick bottom 18, the Walls sloping inwardly to a central door 19, hinged for discharge of ashes and furnished with a suitable fastening catch. The -bricks are held in position by inverted T-sha-ped bars 22, fixed to the metal bottom beneath them,-a's indicated in the cross-section Fig 3.

A limited amount of fresh air may be admitted to the fuel and combustion chambers by means of hollow stay "bolts or tubes 21, Which I thread externally and introduce through the water walls 6, and terminally upset them, a indicated Figs. 1,, 2 and 3. I-hoWever make no claim to this feature.

I claim as my invention:

1. In combination with a firebox having water walls at its front, sides and top, a fuel grate consisting of water tubes lying in substantially the same plane and close to eachother, certain of which are of greater length than the remaining tubes, two series ofv upright Water tubes coupled to the grate tubes and arranged in planes which are parallel from their upperto their extreme lower ends, said series extending transversely completely across the fire box, the upright tubes being connected to thecrown sheet and the grate tubes to the front water wall,

and a solid barrier of independent fire brick filling the space between the series of up- 30 right tubes and having a flat bottom or base resting on and supported by the extended parts of the longer tubes 0f the fire grate.

2. In a down draft locomotive "fi-re box having tubular grate bars and upright tu- 35 bular extensions thereof, for water circulation as described, the combination therewith of the tubular manifold 17, adapted for water communication through the crown sheet and provided with threaded depend- 1e ing arms to receive said extensions, substantially as set forth.

3. In a down draft locomotive fire-box a single tubular fuel grate and upright tubular extensions thereof and a transverse bar- 451 rier connected to and depending from the crown sheet, serving to deflect the caloric current between the gratebars, in combination with a fire brick heat reflecting bottom arranged to deflect the heat beyond the 50 Copies of this patent may be obtained tor five cents each, y addressing the Commissioner of Patents, Washington, 1).6. 

